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Mortgage Loans - Mortgage Loans Held for Sale Textual (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Loans Receivable [Line Items]      
Payments for Origination of Mortgage Loans Held-for-sale $ 19,500.0 $ 16,000.0 $ 12,200.0
Proceeds from Sale of Mortgage Loans Held-for-sale 18,900.0 15,500.0 11,800.0
Net gain on sales of loans 561.7 619.1 $ 437.2
Mortgage loans held for sale 2,386.0 2,027.3  
Mortgage loans held for sale, principal amount 2,510.0 1,970.0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Loans Receivable [Line Items]      
Mortgage loans held for sale 2,356.1 2,009.4  
Loan Origination Commitments [Member]      
Loans Receivable [Line Items]      
Derivative, Notional Amount 532.4 834.6  
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Loans Receivable [Line Items]      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net $ 4.8 1.1  
Other Customer [Member] | Mortgage Loans | Customer Concentration Risk      
Loans Receivable [Line Items]      
Concentration Risk, Percentage 30.00%    
Loans Sold to FNMA or securities backed by GNMA [Member] | Mortgage Loans | Customer Concentration Risk      
Loans Receivable [Line Items]      
Concentration Risk, Percentage 62.00%    
Hedging Instruments Related To IRLCs [Member]      
Loans Receivable [Line Items]      
Derivative, Notional Amount $ 3,800.0 1,400.0  
Hedging Instruments Related To IRLCs [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Loans Receivable [Line Items]      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net 317.8 8.5  
Uncommitted Loans [Member]      
Loans Receivable [Line Items]      
Mortgage loans held for sale $ 1,600.0 $ 1,300.0